Download OKY T/3, T/5-W5 Series

OKY T/3, T/5-W5 Series
www.murata-ps.com
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
PRODUCT OVERVIEW
The OKY-T/3 and -T/5 series are miniature nonisolated Point-of-Load (POL) switch mode DC/DC
power converters for embedded applications. The
module is fully compatible with Distributed-power
Open Standards Alliance (DOSA) industry-standard
specifications (www.dosapower.com). Applications
include powering CPU’s, datacom/telecom systems,
programmable logic and mixed voltage systems.
The wide input range is 2.4 to 5.5 Volts DC. Two
maximum output currents are offered, 3 Amps (T/3
models) or 5 Amps (T/5 models). Based on fixed-
Typical unit
frequency synchronous buck converter switching
topology, the high power conversion efficient Point
of Load (POL) module features programmable
output voltage and On/Off control. These converters
also include under voltage lock out (UVLO), output
short circuit protection, over-current and over
temperature protections.
These units are designed to meet all standard
UL/EN/IEC 60950-1 safety and FCC EMI/RFI
emissions certifications and RoHS-6 hazardous
substance compliance.
FEATURES
■
Non-isolated SMT POL DC/DC power module
■
2.4-5.5Vdc input voltage range
■
Programmable output voltage from 0.7525-3.63Vdc
■
3 Amp (T/3) or 5 Amp (T/5) output current models
■
Drives 1000 μF ceramic capacitive loads
■
High power conversion efficiency at 96%
■
Outstanding thermal derating performance
■
Over temperature and over current protection
■
On/Off control
■
UL/EN/IEC 60950-1 safety
■
Industry-standard (DOSA) surface-mount package
■
RoHS-6 hazardous substance compliance
Contents
Description, Connection Diagram, Photograph
Ordering Guide, Model Numbering, Product Label
Mechanical Specifications, Input/Output Pinout
Detailed Electrical Specifications
Output Voltage Adjustment, Soldering Guidelines
Technical Notes
OKY-T/3-W5 Performance Data and Oscillograms
OKY-T/5-W5 Performance Data and Oscillograms
Tape and Reel Information
Page
1
2
3
4
5
6
9
13
19
Connection Diagram
+Vin
F1
+Vout
t4XJUDIJOH
On/Off
Control
Controller
t'JMUFST
t$VSSFOU4FOTF
External
DC
Power
Source
Trim
Reference and
Error Amplifier
Open = On
Closed = Off
(Positive
On/Off)
Common
Common
Figure 1. OKY-T/3, -T/5
Note: Murata Power Solutions strongly recommends an external input fuse, F1.
See specifications.
For full details go to
www.murata-ps.com/rohs
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 1 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
Performance Specifications Summaryand Ordering Guide
ORDERING GUIDE
Output
Root Model ➁
VOUT
(Volts)
Input
Package
R/N (mVp-p)➄ Regulation (Max.)➂
IOUT
IIN,
IIN,
(Amps Power
VIN Nom. Range no load full load
max) (Watts)
Max.
Line
Load
(Volts) (Volts)  (mA)
(Amps)
Efficiency
Min.
Typ.
OKY-T/3-W5N-C
0.7525-3.63
3
9.9
20
±0.2%
±1.5%
5
2.4-5.5
45
2.1
92%
94.4%
OKY-T/3-W5P-C
0.7525-3.63
3
9.9
20
±0.2%
±1.5%
5
2.4-5.5
45
2.1
92%
94.4%
OKY-T/5-W5N-C
0.7525-3.63
5
16.5
20
±0.2%
±1%
5
2.4-5.5
35
3.5
92%
96%
OKY-T/5-W5P-C
0.7525-3.63
5
16.5
20
±0.2%
±1%
5
2.4-5.5
35
3.5
92%
96%
➀ Dimensions are in inches (mm).
➁ These are partial model numbers. Please refer to the part number structure for complete ordering part numbers.
Case C72 ➀
Pinout
0.47 x 0.82 x 0.28
(11.9 x 20.8 x 7.0)
0.47 x 0.82 x 0.28
(11.9 x 20.8 x 7.0)
0.47 x 0.82 x 0.28
(11.9 x 20.8 x 7.0)
0.47 x 0.82 x 0.28
(11.9 x 20.8 x 7.0)
P78
P78
P78
P78

Vin must be 0.5V or higher than Vout.

Ripple and Noise is shown at Vout=1V.
➂ All specifications are at nominal line voltage, Vout=nominal (3.3V) and full load, +25 ˚C. unless otherwise noted.
Output capacitors are 1 μF ceramic and 10 μF electrolytic in parallel. Input cap is 22 μF. See detailed specifications.
I/O caps are necessary for our test equipment and may not be needed for your application.
PART NUMBER STRUCTURE
OK Y - T / 3 - W5 N - C
Okami Non-isolated PoL
Surface Mount
Trimmable Output
Voltage Range
0.75-3.63V
RoHS Hazardous
Substance Compliance
C = RoHS-6 (does not claim EU RoHS exemption
7b–lead in solder)
On/Off Polarity
P = Positive Polarity
N = Negative Polarity
Input Voltage Range
2.4-5.5V
Note: Some model number combinations
may not be available. Contact Murata
Power Solutions for availability.
Maximum Rated Output
Current in Amps
Product Label
Because of the small size of these products, the product label contains a
character-reduced code to indicate the model number and manufacturing date
code. Not all items on the label are always used. Please note that the label differs from the product photograph on page 1. Here is the layout of the label:
Mfg.
date
code
Y01003
Product code
YMDX Rev.
Revision level
Figure 2. Label Artwork Layout
The label contains three rows of information:
First row – Murata Power Solutions logo
Second row – Model number product code (see table)
Third row – Manufacturing date code and revision level
Model Number
Product Code
OKY-T/3-W5N-C
Y00003
OKY-T/3-W5P-C
Y01003
OKY-T/5-W5N-C
Y00005
OKY-T/5-W5P-C
Y01005
The manufacturing date code is four characters:
First character – Last digit of manufacturing year, example 2009
Second character – Month code (1 through 9 and O through D)
Third character – Day code (1 through 9 = 1 to 9, 10 = O and
11 through 31 = A through Z)
Fourth character – Manufacturing information
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 2 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
MECHANICAL SPECIFICATIONS
TOP VIEW
PIN #1 THIS
CORNER (FARSIDE)
11.9
0.47
ISOMETRIC
VIEW
10.67
0.420
REF
NOZZLE
PICKUP
POINT
PIN #1
5.64
0.222
REF
20.8
0.82
INPUT/OUTPUT CONNECTIONS
OKY-T/3, -T/5
SIDE VIEW
END VIEW
7.0
0.28
MTG PLANE
Pin
1
2
3
4
5
Function
On/Off Control*
+VIN
Ground (Common)
Trim
+VOUT
*The Remote On/Off can be provided with
either positive (P suffix) or negative (N
suffix) polarity
1.59
0.063
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
BOTTOM VIEW
1.59
0.063
TYP
2.29
0.090
TYP
1.5
0.06
3
4
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 1˚
5
Components are shown for reference only.
1
8.63
0.340
[20.8] 0.82 REF
[2.41] 0.095 MIN
[2.79] 0.110 MAX
2
0.25
0.010
1.8
0.07
[3.05] 0.120 MIN
[3.43] 0.135 MAX
4.57
0.180
8.63
0.340
[11.9]
0.47
REF
[8.63] 0.340
12.69
0.500
17.52
0.690
MATERIAL:
SMT PINS: COPPER ALLOY
FINISH: (ALL PINS)
GOLD (5u"MIN) OVER NICKEL (50u" MIN)
[4.57]
0.180
[1.8]
0.070
REF
[1.52]
0.060
REF
[8.63]
0.340
[1.52]
0.06
[12.69]
0.500
[17.52]
0.690
RECOMMENDED PAD LAYOUT
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 3 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
Performance and Functional Specifications
See Note 1
Input
Input Voltage Range
Isolation
Start-Up Voltage
Undervoltage Shutdown (see Note 15)
Overvoltage Shutdown
Reflected (Back) Ripple Current (Note 2)
Internal Input Filter Type
Recommended External Fuse
Reverse Polarity Protection
Input Current:
Full Load Conditions
Inrush Transient
Shutdown Mode (Off, UV, OT)
Output in Short Circuit
Low Line (Vin=Vmin)
Environmental
See Ordering Guide and Note 7.
Not isolated
2.05 V
1.90 V
None
20 mA pk-pk
Capacitive
6A
N/A. See fuse information.
Calculated MTBF
Telecordia method (4a)
Calculated MTBF
MIL-HDBK-217N2 method (4b)
Relative Humidity
Safety
Output
Output Power
Output Voltage Range
Minimum Loading
Accuracy (50% load, untrimmed)
Voltage Output Range (Note 13)
Overvoltage Protection (Note 16)
Temperature Coefficient
Ripple/Noise (20 MHz bandwidth)
Line/Load Regulation
Efficiency
9.9W max. (OKY-T/3), 16.5W max. (OKY-T/5)
See Ordering Guide
No minimum load
±2 % of Vnominal
See Ordering Guide
None
±0.02% per °C of Vout range
See Ordering Guide and note 8
See Ordering Guide and note 10
See Ordering Guide
Maximum Capacitive Loading (Note 14)
Cap-ESR=0.001 to 0.01 Ohms
Cap-ESR >0.01 Ohms
1,000 μF
3,000 μF
Current Limit Inception (Note 6)
(98% of Vout setting, after warm up)
5 Amps
2A
Hiccup autorecovery upon overload
removal. (Note 17)
Continuous, no damage
(output shorted to ground)
Converter will start up if the external
output voltage is less than Vnominal.
Restriction of Hazardous Substances
MSL Rating
Dynamic Load Response
90μSec max. to within ±2% of final value
(50-100-50% load step, di/dt=2.5A/μSec)
8 mSec for Vout=nominal (Vin On)
6 mSec for Vout=nominal (Remote On/Off)
300 KHz
See Mechanical Specifications
0.1 ounces (2.8 grams)
Designed to meet FCC part 15, class B,
EN55022 and CISPR22 class B conducted
and radiated (may need external filter)
Designed to meet UL/cUL 60950-1, CSAC22.2 No. 60950-1, IEC/EN 60950-1
RoHS-6 (does not claim EU RoHS exemption
7b–lead in solder)
2
Absolute Maximum Ratings
Input Voltage (Continuous or transient)
On/Off Control
Input Reverse Polarity Protection
Output Current (Note 7)
0 V.to +5.8 Volts max.
0 V. min. to +Vin max.
See Fuse section
Current-limited. Devices can withstand a
sustained short circuit without damage.
The outputs are not intended to accept
appreciable reverse current.
Storage Temperature
-55 to +125 ˚C.
Lead Temperature
See soldering specifications
Absolute maximums are stress ratings. Exposure of devices to greater than any of
any of these conditions may adversely affect long-term reliability. Proper operation
under conditions other than those listed in the Performance/Functional Specifications
Table is not implied nor recommended.
Specification Notes:
(1)
Specifications are typical at +25 °C, Vin=nominal (+5V.), Vout=nominal (+3.3V), full load, external caps and
natural convection unless otherwise indicated. Extended tests at full power must supply substantial forced
airflow.
All models are tested and specified with external 1 μF paralleled with 10μF ceramic/tantalum output
capacitors and a 22 μF external input capacitor. All capacitors are low ESR types. These capacitors are
necessary to accommodate our test equipment and may not be required to achieve specified performance
in your applications. However, Murata Power Solutions recommends installation of these capacitors. All
models are stable and regulate within spec under no-load conditions.
Dynamic Characteristics
Start-Up Time
(Vin on or On/Off to Vout regulated)
Switching Frequency
to 85%/+85 ˚C., non-condensing
Outline Dimensions
Weight
Electromagnetic Interference
ON = Open pin or ground to +0.4V. max.
OFF = +1.5V min. to +Vin
1 mA max.
ON = Open pin (internally pulled up) or
+7.8Vdc to +Vin max.
OFF = Ground pin to +0.4V. max.
1 mA max.
Current
Prebias Startup
8,398,873 hours
8,228,758 hours
8,338,304 hours
8,170,610 hours
Physical
Current
Positive Logic (“P” model suffix)
Short Circuit Duration
OKY-T/3-W5N-C:
OKY-T/3-W5P-C:
OKY-T/5-W5N-C:
OKY-T/5-W5P-C:
Operating Temperature Range (Ambient, vertical mount)
See derating curves
-40 to +85 ˚C. with derating (Note 9)
Operating PC Board Temperature
-40 to +100 ˚Celsius max., no derating (12)
Storage Temperature Range
-55 to +125 deg. C.
Thermal Protection/Shutdown
+130 ˚Celsius
See Ordering Guide
0.4 A2Sec.
5 mA
60 mA
2.66 A. (OKY-T/3-W5)
4.41 A. (OKY-T/5-W5)
Remote On/Off Control (Note 5)
Negative Logic (“N” model suffix)
Short Circuit Mode
Short Circuit Current Output
Protection Method
OKY-T/3-W5N-C: 10,961,200 hours
OKY-T/3-W5P-C: 10,830,600 hours
OKY-T/5-W5N-C: 9,893,917 hours
OKY-T/5-W5P-C: 9,765,731 hours
(2)
Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=2 x
100 μF tantalum, Cbus=1000 μF electrolytic, Lbus=1 μH.
(3)
Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher
temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current outputs if the total
RMS current over time does not exceed the Derating curve.
(4a) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground fixed
conditions, Tpcboard=+25 ˚C, full output load, natural air convection.
(4b) Mean Time Before Failure is calculated using the MIL-HDBK-217N2 method, ground benign, +25ºC., full
output load, natural convection.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 4 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
Specification Notes, Cont.:
Soldering Guidelines
(5)
The On/Off Control Input should use either a switch or an open collector/open drain transistor referenced
to -Input Common. A logic gate may also be used by applying appropriate external voltages which do not
exceed +Vin.
(6)
Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected
setting.
(7)
For W5 models, the Input Voltage must exceed the Output Voltage at all times by 0.5 Volts or greater.
(8)
Output noise may be further reduced by adding an external filter. At zero output current, the output may
contain low frequency components which exceed the ripple specification. The output may be operated
indefinitely with no load.
(9)
All models are fully operational and meet published specifications, including “cold start” at –40˚ C.
Murata Power Solutions recommends the specifications below when installing these
converters. These specifications vary depending on the solder type. Exceeding these
specifications may cause damage to the product. Your production environment
may differ therefore please thoroughly review these guidelines with your process
engineers.
Reflow Solder Operations for surface-mount products (SMT)
(10) Regulation specifications describe the deviation as the line input voltage or output load current is varied
from a nominal midpoint value to either extreme.
For Sn/Ag/Cu based solders:
(11) Other input or output voltage ranges will be reviewed under scheduled quantity special order.
Preheat Temperature
Less than 1 ºC. per second
(12) Maximum PC board temperature is measured with the sensor in the center of the converter.
Time over Liquidus
45 to 75 seconds
Maximum Peak Temperature
260 ºC.
Cooling Rate
Less than 3 ºC. per second
(13) Do not exceed maximum power specifications when adjusting the output trim.
(14) The maximum output capacitive loads depend on the the Equivalent Series Resistance (ESR) of the external
output capacitor and, to a lesser extent, the distance and series impedance to the load. Larger caps will
reduce output noise but may change the transient response. Newer ceramic caps with very low ESR may
require lower capacitor values to avoid instability. Thoroughly test your capacitors in the application. Please
refer to the Output Capacitive Load Application Note.
For Sn/Pb based solders:
(15) Do not allow the input voltage to degrade lower than the input undervoltage shutdown voltage at all times.
Otherwise, you risk having the converter turn off. The undervoltage shutdown is not latching and will
attempt to recover when the input is brought back into normal operating range.
Preheat Temperature
Less than 1 ºC. per second
Time over Liquidus
60 to 75 seconds
(16) The outputs are not intended to sink appreciable reverse current.
Maximum Peak Temperature
235 ºC.
(17) “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output.
If the overcurrent condition still exists, the restart current will be removed and then tried again. This short
current pulse prevents overheating and damaging the converter. Once the fault is removed, the converter
immediately recovers normal operation.
Cooling Rate
Less than 3 ºC. per second
In the tables below, the calculated resistance is given. Do not exceed the
specified limits of the output voltage or the converter’s maximum power
rating when applying these resistors. Also, avoid high noise at the Trim
input. However, to prevent instability, you should never connect any capacitors to Trim.
Peak Temp.
235-260° C
250
200
Temperature (°C)
Output Voltage Adustment
The output voltage may be adjusted over a limited range by connecting an
external trim resistor (Rtrim) between the Trim pin and Ground. The Rtrim
resistor must be a 1/10 Watt precision metal film type, ±1% accuracy or
better with low temperature coefficient, ±100 ppm/oC. or better. Mount the
resistor close to the converter with very short leads or use a surface mount
trim resistor.
Recommended Lead-free Solder Reflow Profile
Reflow Zone
150
Soaking Zone
time above 217° C
45-75 sec
120 sec max
100
<1.5° C/sec
High trace = normal upper limit
Low trace = normal lower limit
Preheating Zone
50
240 sec max
0
0
30
60
90
120
150
180
210
240
270
300
Time (sec)
High trace = normal upper limit
OKY-T/3-W5, -T/5-W5
Output Voltage
Low trace - normal lower limit
Calculated Rtrim (KΩ)
3.3 V.
3.160
2.5 V.
6.947
2.0 V.
11.780
1.8 V.
15.004
1.5 V.
23.077
1.2 V.
41.973
1.0 V.
80.021
0.7525 V.
∞ (open)
Resistor Trim Equation, W5 models:
21070
RTRIM () = _____________ – 5110
VOUT – 0.7525V
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 5 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
TECHNCIAL NOTES
Input Fusing
Certain applications and/or safety agencies may require fuses at the inputs of
power conversion components. Fuses should also be used when there is the
possibility of sustained input voltage reversal which is not current-limited. We
recommend a time delay fuse installed in the ungrounded input supply line
with a value which is approximately twice the maximum line current, calculated at the lowest input voltage.
The installer must observe all relevant safety standards and regulations. For
safety agency approvals, install the converter in compliance with the end-user
safety standard, i.e. IEC/EN/UL 60950-1.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, converters will not begin to regulate properly
until the ramping-up input voltage exceeds and remains at the Start-Up
Threshold Voltage (see Specifications). Once operating, converters will not
turn off until the input voltage drops below the Under-Voltage Shutdown Limit.
Subsequent restart will not occur until the input voltage rises again above the
Start-Up Threshold. This built-in hysteresis prevents any unstable on/off operation at a single input voltage.
Users should be aware however of input sources near the Under-Voltage
Shutdown whose voltage decays as input current is consumed (such as
capacitor inputs), the converter shuts off and then restarts as the external
capacitor recharges. Such situations could oscillate. To prevent this, make
sure the operating input voltage is well above the UV Shutdown voltage AT ALL
TIMES.
Start-Up Time
Assuming that the output current is set at the rated maximum, the Vin to Vout
Start-Up Time (see Specifications) is the time interval between the point when
the ramping input voltage crosses the Start-Up Threshold and the fully loaded
regulated output voltage enters and remains within its specified accuracy band.
Actual measured times will vary with input source impedance, external input
capacitance, input voltage slew rate and final value of the input voltage as it
appears at the converter.
For best performance, we recommend installing a low-ESR capacitor
immediately adjacent to the converter’s input terminals. The capacitor should
be a ceramic type such as the Murata GRM32 series or a polymer type. Initial
suggested capacitor values are 10 to 22 μF, rated at twice the expected maximum input voltage. Make sure that the input terminals do not go below the
undervoltage shutdown voltage at all times. More input bulk capacitance may
be added in parallel (either electrolytic or tantalum) if needed.
Recommended Output Filtering
The converter will achieve its rated output ripple and noise with no additional
external capacitor. However, the user may install more external output capacitance to reduce the ripple even further or for improved dynamic response.
Again, use low-ESR ceramic (Murata GRM32 series) or polymer capacitors.
Initial values of 10 to 47 μF may be tried, either single or multiple capacitors in
parallel. Mount these close to the converter. Measure the output ripple under
your load conditions.
Use only as much capacitance as required to achieve your ripple and noise
objectives. Excessive capacitance can make step load recovery sluggish or
possibly introduce instability. Do not exceed the maximum rated output capacitance listed in the specifications.
Input Ripple Current and Output Noise
All models in this converter series are tested and specified for input reflected
ripple current and output noise using designated external input/output components, circuits and layout as shown in the figures below. In the figure below,
the Cbus and Lbus components simulate a typical DC voltage bus. Please
note that the values of Cin, Lbus and Cbus will vary according to the specific
converter model.
TO
OSCILLOSCOPE
CURRENT
PROBE
+INPUT
VIN
+
–
+
–
LBUS
CBUS
CIN
These converters include a soft start circuit to moderate the duty cycle of its
PWM controller at power up, thereby limiting the input inrush current.
The On/Off Remote Control interval from On command to Vout regulated
assumes that the converter already has its input voltage stabilized above the
Start-Up Threshold before the On command. The interval is measured from the
On command until the output enters and remains within its specified accuracy
band. The specification assumes that the output is fully loaded at maximum
rated current. Similar conditions apply to the On to Vout regulated specification
such as external load capacitance and soft start circuitry.
Recommended Input Filtering
The user must assure that the input source has low AC impedance to provide
dynamic stability and that the input supply has little or no inductive content,
including long distributed wiring to a remote power supply. The converter will
operate with no additional external capacitance if these conditions are met.
-INPUT
CIN = 2 x 100μF, ESR < 700mΩ @ 100kHz
CBUS = 1000μF, ESR < 100mΩ @ 100kHz
LBUS = 1μH
Figure 3. Measuring Input Ripple Current
In figure 4, the two copper strips simulate real-world printed circuit impedances between the power supply and its load. In order to minimize circuit
errors and standardize tests between units, scope measurements should be
made using BNC connectors or the probe ground should not exceed one halfinch and soldered directly to the test circuit.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 6 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
CAUTION: If you routinely or accidentally exceed these Derating guidelines,
the converter may have an unplanned Over Temperature shut down. Also, these
graphs are all collected at slightly above Sea Level altitude. Be sure to reduce
the derating for higher density altitude.
COPPER STRIP
+OUTPUT
C1
C2
SCOPE
RLOAD
-OUTPUT
COPPER STRIP
C1 = 0.1μF CERAMIC
C2 = 10μF TANTALUM
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 4. Measuring Output Ripple and Noise (PARD)
Minimum Output Loading Requirements
All models regulate within specification and are stable under no load to full
load conditions. Operation under no load might however slightly increase
output ripple and noise.
Thermal Shutdown
To prevent many over temperature problems and damage, these converters
include thermal shutdown circuitry. If environmental conditions cause the
temperature of the DC/DC’s to rise above the Operating Temperature Range
up to the shutdown temperature, an on-board electronic temperature sensor
will power down the unit. When the temperature decreases below the turn-on
threshold, the converter will automatically restart. There is a small amount of
hysteresis to prevent rapid on/off cycling.
CAUTION: If you operate too close to the thermal limits, the converter may
shut down suddenly without warning. Be sure to thoroughly test your application to avoid unplanned thermal shutdown.
Temperature Derating Curves
The graphs in this data sheet illustrate typical operation under a variety of
conditions. The Derating curves show the maximum continuous ambient air
temperature and decreasing maximum output current which is acceptable
under increasing forced airflow measured in Linear Feet per Minute (“LFM”).
Note that these are AVERAGE measurements. The converter will accept brief
increases in current or reduced airflow as long as the average is not exceeded.
Note that the temperatures are of the ambient airflow, not the converter
itself which is obviously running at higher temperature than the outside air.
Also note that very low flow rates (below about 25 LFM) are similar to “natural
convection”, that is, not using fan-forced airflow.
Murata Power Solutions makes Characterization measurements in a closed
cycle wind tunnel with calibrated airflow. We use both thermocouples and an
infrared camera system to observe thermal performance.
Output Fusing
The converter is extensively protected against current, voltage and temperature
extremes. However your output application circuit may need additional protection. In the extremely unlikely event of output circuit failure, excessive voltage
could be applied to your circuit. Consider using an appropriate fuse in series
with the output.
Output Current Limiting
Current limiting inception is defined as the point at which full power falls below
the rated tolerance. See the Performance/Functional Specifications. Note particularly that the output current may briefly rise above its rated value in normal
operation as long as the average output power is not exceeded. This enhances
reliability and continued operation of your application. If the output current is
too high, the converter will enter the short circuit condition.
Output Short Circuit Condition
When a converter is in current-limit mode, the output voltage will drop as the
output current demand increases. If the output voltage drops too low (approximately 98% of nominal output voltage for most models), the magnetically
coupled voltage used to develop primary side voltages will also drop, thereby
shutting down the PWM controller. Following a time-out period, the PWM will
restart, causing the output voltage to begin ramping up to its appropriate value.
If the short-circuit condition persists, another shutdown cycle will initiate. This
rapid on/off cycling is called “hiccup mode”. The hiccup cycling reduces the
average output current, thereby preventing excessive internal temperatures
and/or component damage. A short circuit can be tolerated indefinitely.
The “hiccup” system differs from older latching short circuit systems
because you do not have to power down the converter to make it restart. The
system will automatically restore operation as soon as the short circuit condition is removed.
Remote On/Off Control
On the input side, a remote On/Off Control can be ordered with either polarity.
Please refer to the Connection Diagram on page 1 for On/Off connections.
Positive polarity models are enabled when the On/Off pin is left open or is
pulled high to +Vin with respect to –Vin. Positive-polarity devices are disabled
when the On/Off is grounded or brought to within a low voltage (see Specifications) with respect to –Vin.
Negative polarity devices are on (enabled) when the On/Off pin is left open
or brought to within a low voltage (see Specifications) with respect to –Vin. The
device is off (disabled) when the On/Off is pulled high (see Specifications) with
respect to –Vin.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 7 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
Dynamic control of the On/Off function should be able to sink appropriate
signal current when brought low and withstand appropriate voltage when
brought high. Be aware too that there is a finite time in milliseconds (see
Specifications) between the time of On/Off Control activation and stable,
regulated output. This time will vary slightly with output load type and current
and input conditions.
Output Capacitive Load
These converters do not require external capacitance added to achieve rated
specifications. Users should only consider adding capacitance to reduce
switching noise and/or to handle spike current load steps. Install only enough
capacitance to achieve noise objectives. Excess external capacitance may
cause regulation problems, degraded transient response and possible oscillation or instability.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 8 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
OKY-T/3-W5 PERFORMANCE DATA (Vout = 1.2V)
OKY-T/3-W5 Efficiency vs. Line Voltage and Load Current @ 25°C (VOUT = 1.2V)
OKY-T/3-W5 Maximum Current Temperature Derating at Sea Level
(VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V)
100
3.5
90
80
3.0
Natural convection
VIN = 5.5V
VIN = 5V
VIN = 2.4V
60
50
2.5
Output Current (Amps)
Efficiency (%)
70
40
30
2.0
1.5
1.0
20
0.5
10
0
0
0.5
1
1.5
2
2.5
3
3.5
Load Current (Amps)
On/Off Enable Startup (Vin=5.5V, Vout=1.2V, Iout=3A, Cload=0)
0.0
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
Output Ripple and Noise (Vin=5V, Vout=1.2V, Iout=3A, Cload=0, ScopeBW=100MHz)
Trace 4=Enable, Trace2=Vout
Step Load Transient Response (Vin=5V, Vout=1.2V, Cload=0, Iout=1.5A to 3A)
Step Load Transient Response (Vin=5V, Vout=1.2V, Cload=0, Iout=3A to 1.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 9 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
OKY-T/3-W5 PERFORMANCE DATA (Vout = 1.5V)
OKY-T/3-W5 Efficiency vs. Line Voltage and Load Current @ 25°C (VOUT = 1.5V)
OKY-T/3-W5 Maximum Current Temperature Derating at Sea Level
(VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V)
3.5
100
VIN = 5.5V
VIN = 5V
VIN = 2.4V
60
Natural convection
2.5
Output Current (Amps)
Efficiency (%)
3.0
80
40
2.0
1.5
1.0
20
0.5
0
0
0.5
1
1.5
2
2.5
3
3.5
Load Current (Amps)
0.0
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
On/Off Enable Startup (Vin=5.5V, Vout=1.5V, Iout=3A, Cload=0)
Output Ripple and Noise (Vin=5V, Vout=1.5V, Iout=3A, Cload=0, ScopeBW=100MHz)
Trace 4=Enable, Trace2=Vout
Step Load Transient Response (Vin=5V, Vout=1.5V, Cload=0, Iout=1.5A to 3A)
Step Load Transient Response (Vin=5V, Vout=1.2V, Cload=0, Iout=3A to 1.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 10 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
OKY-T/3-W5 PERFORMANCE DATA (Vout = 1.8V)
OKY-T/3-W5 Efficiency vs. Line Voltage and Load Current @ 25°C (VOUT = 1.8V)
OKY-T/3-W5 Maximum Current Temperature Derating at Sea Level
(VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V)
3.5
3.0
80
VIN = 5.5V
VIN = 5V
VIN = 2.4V
60
Natural convection
2.5
Output Current (Amps)
Efficiency (%)
100
40
20
2.0
1.5
1.0
0.5
0
0
0.5
1
1.5
2
2.5
Load Current (Amps)
3
3.5
0.0
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
On/Off Enable Startup (Vin=5.5V, Vout=1.8V, Iout=3A, Cload=0)
Output Ripple and Noise (Vin=5V, Vout=1.8V, Iout=3A, Cload=0, ScopeBW=100MHz)
Trace 4=Enable, Trace2=Vout
Step Load Transient Response (Vin=5V, Vout=1.8V, Cload=0, Iout=1.5A to 3A)
Step Load Transient Response (Vin=5V, Vout=1.8V, Cload=0, Iout=3A to 1.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 11 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
OKY-T/3-W5 PERFORMANCE DATA (Vout = 2.5V)
OKY-T/3-W5 Efficiency vs. Line Voltage and Load Current @ 25°C (VOUT = 2.5V)
OKY-T/3-W5 Maximum Current Temperature Derating at Sea Level
(VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V)
100
3.5
95
3.0
Natural convection
VIN = 5.5V
VIN = 5V
VIN = 3V
85
2.5
Output Current (Amps)
Efficiency (%)
90
80
75
2.0
1.5
1.0
70
0.5
65
0
0.5
1
1.5
2
2.5
Load Current (Amps)
3
On/Off Enable Startup (Vin=5.5V, Vout=2.5V, Iout=3A, Cload=0)
3.5
0.0
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
Output Ripple and Noise (Vin=5V, Vout=2.5V, Iout=3A, Cload=0, ScopeBW=100MHz)
Trace 4=Enable, Trace2=Vout
Step Load Transient Response (Vin=5V, Vout=2.5V, Cload=0, Iout=1.5A to 3A)
Step Load Transient Response (Vin=5V, Vout=2.5V, Cload=0, Iout=3A to 1.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 12 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
OKY-T/3-W5 PERFORMANCE DATA (Vout = 3.3V)
On/Off Enable Startup (Vin=5.5V, Vout=3.3V, Iout=3A, Cload=0)
Output Ripple and Noise (Vin=5V, Vout=3.3V, Iout=3A, Cload=0, ScopeBW=100MHz)
Trace 4=Enable, Trace2=Vout
Step Load Transient Response (Vin=5V, Vout=3.3V, Cload=0, Iout=1.5A to 3A)
Step Load Transient Response (Vin=5V, Vout=3.3V, Cload=0, Iout=3A to 1.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div.
OKY-T/5-W5 PERFORMANCE DATA (Vout = 1V)
OKY-T/5-W5 Efficiency vs. Line Voltage and Load Current @ 25°C (VOUT = 1V)
OKY-T/5-W5 Maximum Current Temperature Derating at Sea Level
(VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V)
100
90
80
5.0
Natural convection
4.0
VIN = 5.5V
VIN = 5V
VIN = 2.4V
60
50
Output Current (Amps)
Efficiency (%)
70
40
30
3.0
2.0
1.0
20
0
20
10
0
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
0
1
2
3
4
5
6
Load Current (Amps)
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 13 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
OKY-T/5-W5 PERFORMANCE DATA (Vout = 1.2V)
OKY-T/5-W5 Efficiency vs. Line Voltage and Load Current @ 25°C (VOUT = 1.2V)
OKY-T/5-W5 Maximum Current Temperature Derating at Sea Level
(VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V)
100
Natural convection
VIN = 5.5V
VIN = 5V
VIN = 2.4V
60
4.0
Output Current (Amps)
Efficiency (%)
5.0
80
40
2.0
1.0
20
0
3.0
0
20
0
1
2
3
4
5
6
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
Load Current (Amps)
On/Off Enable Startup (Vin=5.5V, Vout=1.2V, Iout=5A, Cload=0)
Output Ripple and Noise (Vin=5V, Vout=1.2V, Iout=5A, Cload=0, ScopeBW=100MHz)
Trace 4=Enable, Trace2=Vout
Step Load Transient Response (Vin=5V, Vout=1.2V, Cload=0, Iout=2.5A to 5A)
Step Load Transient Response (Vin=5V, Vout=1.2V, Cload=0, Iout=5A to 2.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 14 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
OKY-T/5-W5 PERFORMANCE DATA (Vout = 1.5V)
OKY-T/5-W5 Efficiency vs. Line Voltage and Load Current @ 25°C (VOUT = 1.5V)
OKY-T/5-W5 Maximum Current Temperature Derating at Sea Level
(VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V)
100
Natural convection
VIN = 5.5V
VIN = 5V
VIN = 2.4V
60
4.0
Output Current (Amps)
Efficiency (%)
5.0
80
40
3.0
2.0
1.0
20
0
20
0
0
1
2
3
4
Load Current (Amps)
5
On/Off Enable Startup (Vin=5.5V, Vout=1.5V, Iout=5A, Cload=0)
6
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
Output Ripple and Noise (Vin=5V, Vout=1.5V, Iout=5A, Cload=0, ScopeBW=100MHz)
Trace 4=Enable, Trace2=Vout
Step Load Transient Response (Vin=5V, Vout=1.5V, Cload=0, Iout=2.5A to 5A)
Step Load Transient Response (Vin=5V, Vout=1.5V, Cload=0, Iout=5A to 2.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 15 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
OKY-T/5-W5 PERFORMANCE DATA (Vout = 1.8V)
OKY-T/5-W5 Efficiency vs. Line Voltage and Load Current @ 25°C (VOUT = 1.8V)
OKY-T/5-W5 Maximum Current Temperature Derating at Sea Level
(VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V)
100
Natural convection
VIN = 5.5V
VIN = 5V
VIN = 2.4V
60
4.0
Output Current (Amps)
Efficiency (%)
5.0
80
40
2.0
1.0
20
0
3.0
0
20
0
1
2
3
4
5
6
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
Load Current (Amps)
On/Off Enable Startup (Vin=5.5V, Vout=1.8V, Iout=5A, Cload=0)
Output Ripple and Noise (Vin=5V, Vout=1.8V, Iout=5A, Cload=0, ScopeBW=100MHz)
Trace 4=Enable, Trace2=Vout
Step Load Transient Response (Vin=5V, Vout=1.8V, Cload=0, Iout=2.5A to 5A)
Step Load Transient Response (Vin=5V, Vout=1.8V, Cload=0, Iout=5A to 2.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 16 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
OKY-T/5-W5 PERFORMANCE DATA (Vout = 2.5V)
OKY-T/5-W5 Efficiency vs. Line Voltage and Load Current @ 25°C (VOUT = 2.5V)
OKY-T/5-W5 Maximum Current Temperature Derating at Sea Level
(VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V)
100
95
5.0
Natural convection
4.0
VIN = 5.5V
VIN = 5V
VIN = 3V
85
Output Current (Amps)
Efficiency (%)
90
80
75
3.0
2.0
1.0
70
0
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
65
0
1
2
3
4
Load Current (Amps)
5
On/Off Enable Startup (Vin=5.5V, Vout=2.5V, Iout=5A, Cload=0)
6
Output Ripple and Noise (Vin=5V, Vout=2.5V, Iout=5A, Cload=0, ScopeBW=100MHz)
Trace 4=Enable, Trace2=Vout
Step Load Transient Response (Vin=5V, Vout=2.5V, Cload=0, Iout=2.5A to 5A)
Step Load Transient Response (Vin=5V, Vout=2.5V, Cload=0, Iout=5A to 2.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 17 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
OKY-T/5-W5 PERFORMANCE DATA (Vout = 3.3V)
OKY-T/5-W5 Efficiency vs. Line Voltage and Load Current @ 25°C (VOUT = 3.3V)
OKY-T/5-W5 Maximum Current Temperature Derating at Sea Level
(VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V)
100
95
5.0
Natural convection
4.0
VIN = 5.5V
VIN = 5V
VIN = 3.8V
85
Output Current (Amps)
Efficiency (%)
90
80
75
3.0
2.0
1.0
70
0
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (ºC)
65
0
1
2
3
4
Load Current (Amps)
5
On/Off Enable Startup (Vin=5.5V, Vout=3.3V, Iout=5A, Cload=0)
6
Output Ripple and Noise (Vin=5V, Vout=3.3V, Iout=5A, Cload=0, ScopeBW=100MHz)
Trace 4=Enable, Trace2=Vout
Step Load Transient Response (Vin=5V, Vout=3.3V, Cload=0, Iout=2.5A to 5A)
Step Load Transient Response (Vin=5V, Vout=3.3V, Cload=0, Iout=5A to 2.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 18 of 19
OKY T/3, T/5-W5 Series
Adjustable Output 3 and 5-Amp DOSA-SMT PoLs
TAPE AND REEL INFORMATION
2.33
0.092
(P/U)
16.00
0.630
44.00
1.732
6.86
0.270
ROUND
HOLES
4.00
0.157
22.25
0.876
(P/U)
40.40
1.591
2.00
0.079
OBLONG
HOLES
FEED (UNWIND)
DIRECTION -------
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
TOP COVER TAPE
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 1˚
Components are shown for reference only.
PIN #1 THIS
CORNER
(FARSIDE)
5.64
0.222
REF
101.6
4.00
(CORE)
44.0
1.73
REF
10.67
0.420
20.8
0.82
REF
330.2
13.00
PICKUP NOZZLE
LOCATION
( 3-6mm)
11.9
0.47
REF
PICK & PLACE PICKUP (P/U)
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
13.00
.512
REEL INFORMATION
(400 UNITS PER REEL)
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
© 2012 Murata Power Solutions, Inc.
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MDC_OKY-T/3,T/5-W5 Series.A12 Page 19 of 19